exam Maths Puzzle Numerical Ability

Explain what it means to have a solution to a system of equations

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exam Other Question

A youth group decide to go bowling. You can rent the number of lanes that you need for $100. The cost per person will drop by $0.50 if they can get ten more people to attend. How many people were in the original group? (Please solve in algebra from?) Write each fraction in simplest form.
-15x^3y^3/-20xy^4